CN111650635B - Electron beam welding beam perpendicularity verification and alignment method - Google Patents
Electron beam welding beam perpendicularity verification and alignment method Download PDFInfo
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- CN111650635B CN111650635B CN202010526693.3A CN202010526693A CN111650635B CN 111650635 B CN111650635 B CN 111650635B CN 202010526693 A CN202010526693 A CN 202010526693A CN 111650635 B CN111650635 B CN 111650635B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/29—Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation
- G01T1/2907—Angle determination; Directional detectors; Telescopes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/0006—Electron-beam welding or cutting specially adapted for particular articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/0046—Welding
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B5/245—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing perpendicularity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B5/25—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
- G01B5/252—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes for measuring eccentricity, i.e. lateral shift between two parallel axes
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Abstract
The invention discloses a perpendicularity verification and alignment method for an electron beam welding beam, and relates to the field of electron beam welding. The method sequentially comprises the following steps: s1: determining the turnover angle of the part and the working distance of an electron beam during welding; s2: clamping the two L-shaped test pieces in a tool; s3: welding the first layer of L-shaped test piece; s4: measuring and calculating; s5: the method solves the welding error of the first layer and the second layer in the welding process of the welding joint, avoids the welding deviation defect of the welding seam of the second layer, and greatly improves the electron beam welding efficiency of the welding joint.
Description
Technical Field
The invention relates to the field of electron beam welding, in particular to a method for verifying and aligning the verticality of an electron beam welding beam.
Background
In the field of aeroengines, a certain type of welding assembly is special in structure, the welding assembly needs to be turned to the position shown in figure 1 during welding, and a large height difference exists between a first layer and a second layer after the welding assembly is turned; if there are assembly accuracy error and the influence of external space magnetic field in electron beam, electron beam inside static part and each component of electromagnetism part, there will be certain contained angle in electron beam axis and the horizontal plane behind the electron beam leaving electron beam, lead to in welding process in the first layer welding seam centering welding back then, weld the partial defect can appear in second layer welding seam, this kind of defect is not allowed to exist in the air welding.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for verifying and aligning the perpendicularity of an electron beam welding beam, which has the following specific technical scheme:
a perpendicularity verification and alignment method for an electron beam welding beam sequentially comprises the following steps:
s1: determining the turnover angle of the part and the working distance of the electron beam during welding according to the size and the structure of the part and the accessibility of the electron beam;
s2: preparing an L-shaped test piece, engraving scale marks on the surface of the L-shaped test piece, and then clamping the two L-shaped test pieces in a tool;
s3: firstly, two L-shaped test pieces are taken for welding to obtain an electron beam welding parameter which requires that weld joints on the front and back surfaces of the two L-shaped test pieces are well formed, then two L-shaped test pieces of a second group are replaced, and a first scale mark close to the edge of the first layer of L-shaped test piece is welded;
s4: judging the inclination direction of the electron beam from the welding line on the reverse side of the L-shaped test piece on the second layer, measuring along the direction of the transverse scale mark by taking the adjacent scale mark on the left side of the welding line as a reference, wherein the width from the left side of the welding line to the adjacent scale mark is W 1 The width of the right side of the welding line from the adjacent scale mark is W 2 The distance between adjacent graduation lines is S; center deviation value OY of weld 1 The calculation formula of (c) is:
W 1 : the distance between one side of the welding line and the adjacent scale mark is wide;
W 2 : the other side of the welding line is away from the width of the adjacent scale mark;
s: the distance between adjacent scale marks on the L-shaped test piece;
calculating the deviation OY of the first layer of L-shaped test piece according to the known data 2 ，OY 2 The calculation formula of (2) is as follows:
OY 1 : a central deviation value of a welding seam;
D 1 : the distance between the electron beam and the bottom surface of the first layer of L-shaped test piece;
D 2 : the distance between the center of the deflection coil and the electron beam outlet;
D 3 : the distance between the bottom surface of the first layer of L-shaped test piece and the bottom surface of the second layer of L-shaped test piece;
s5: the deviation value OY of the electron beam on the first layer of L-shaped test piece to the positive direction of the Y axis is known 2 And then, correcting and verifying a corrected value on the first layer of L-shaped test piece:
s5-1: forming a spot on the upper and lower small beams of the first layer of L-shaped test piece, and adjusting a reference cross line on the observation screen to enable the cross point of the reference cross line to be positioned in the center of the spot;
s5-2: moving the mechanical axis Y and moving the deviation value OY in the negative direction of the Y axis 2 Then adjusting the reference reticle intersection back to the center of the beam spot;
s5-3: opening a deflection coil and discharging small beam current, and enabling beam spots to coincide with the cross points of the reference cross lines by adjusting Y-direction parameters of the deflection coil;
s5-4: obtaining a parameter of a deflection coil, welding the first layer of L-shaped test piece close to the third scale mark on the edge of the first layer of L-shaped test piece in the electron beam alignment after the parameter is set, and measuring the alignment effect of the two L-shaped test pieces after the welding is finished;
s6: after the correction value is verified on the L-shaped test piece, verification is carried out on a simulation piece simulating the outline of a real part, before the simulation piece is welded, scale marks are engraved on the two sides of the butt joint face, and after the welding is completed, the scale marks are used as references to observe and measure whether the welding seam deviates from the butt joint face.
Preferably, the graduation lines in step S2 include a plurality of sets of parallel graduation lines arranged on the front and back sides of the L-shaped test piece and parallel to the movement track of the electron beam, and vertical graduation lines arranged on the front and back sides of the L-shaped test piece and perpendicular to the movement track.
Preferably, firstly, the tool is turned over during clamping of the L-shaped test piece in the step S2, then the frame-type level meter is used for measuring the clamping surface, the clamping surface is ensured to be parallel to the moving axis by adjusting the rotating shaft, and the L-shaped test piece is clamped after the adjustment is finished, so that the projection superposition of the two L-shaped test pieces in the direction perpendicular to the welding surface is ensured.
Preferably, before the L-shaped test piece is welded in step S3, a magnetism isolating cylinder made of mu metal is added at the electron beam outlet.
Preferably, in step S4, the measurement is assisted by a magnifying glass, and the measurement of the L-shaped test piece is performed by a magnifying glass with ten times scale.
The invention has the following beneficial effects:
aiming at the beam perpendicularity control of the welding joint, the beam perpendicularity verification and alignment of the electron beam welding are completed by five steps of determining a working distance, preparing an L-shaped test piece, welding the test piece, measuring a deviation value, calculating a correction value and verifying the correction value, so that the welding error of a first layer and a second layer of the welding joint in the welding process is solved, the welding deviation defect of a welding seam of the second layer is avoided, and the electron beam welding efficiency of the welding joint is greatly improved.
Drawings
FIG. 1 is a longitudinal cross-sectional view of a weld of a weldment of the present invention;
FIG. 2 is a cross-sectional view of a weld of a weldment of the present invention;
FIG. 3 is a schematic view of the welding of the weldment of the present invention;
FIG. 4 is a schematic structural view of an L-shaped test piece according to the present invention;
FIG. 5 is a schematic structural diagram of scale marks of an L-shaped test piece according to the present invention;
FIG. 6 is a schematic structural view of the tooling of the present invention;
FIG. 7 is a schematic structural diagram of the L-shaped test piece and the tooling in the invention;
FIG. 8 is a schematic view of a weld on an L-shaped test piece according to the present invention;
FIG. 9 is an enlarged view of a portion of FIG. 8 at I;
FIG. 10 is a diagram illustrating the offset calculation in the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Examples
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "communicating," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1 to 10, the method for verifying and aligning the perpendicularity of the welding beam current of the electron beam 1 sequentially comprises the following steps:
s1: as shown in fig. 1 and 2, the flip angle and the working distance during welding are determined according to the size and the structure of the part and the accessibility of the electron beam 1, the flip angle of the part during welding is 43 degrees, the working distance is as shown in fig. 3, the distance from the electron beam 1 to the part is 522mm, and the maximum distance from the surface of the first layer to the surface of the second layer of the part is 120mm.
S2: as shown in fig. 4 and 5, according to the size of the welded joint and the welding requirement of the electron beam 1, the following specification L-shaped test piece 2 is prepared:
as shown in fig. 6 and 7, the short side of the L-shaped test piece 2 is used for clamping a process table, and the long side of the L-shaped test piece 2 is used as a test site for welding. Meanwhile, the surface of the L-shaped test piece 2 needs to engrave scale marks 3 for welding measurement. The scale marks 3 comprise 9 parallel scale lines 31 which are arranged on the front and back sides of the L-shaped test piece 2 and are parallel to the motion track of the electron beam 1 and 1 vertical scale line 32 which is arranged on the front and back sides of the L-shaped test piece 2 and is vertical to the motion track. The distance between the parallel scribe lines 31 is 5mm, and the width of the vertical scribe lines 32 is not too large, and 0.05mm at maximum, so as not to affect the subsequent measurement.
Then with the clamping of L shape test block 2 in frock 4, for making things convenient for clamping L shape test block 2, set up two draw-in grooves on the clamping face of L shape test block 2, the draw-in groove is wide by 10mm, draw-in groove interval 120mm, then set up the draw-in groove on frock 4, L shape test block 2 clamping is fixed to the draw-in groove of frock 4 in and with the clamp plate, can guarantee with the clamping face straightness and two L shape test block 2's interval that hangs down. At first overturn 43 degrees to frock 4 in the clamping process, use frame spirit level to measure 2 clamping surfaces in L shape test block, guarantee through the adjustment rotation axis that 2 clamping surfaces in L shape test block are parallel with the movement axis, the adjustment is accomplished the back clamping in L shape test block 2 test block, guarantees that the projection of two 2 test blocks in L shape test block in perpendicular welding surface direction overlaps.
S3: because the distance from the electron beam 1 to the surface of the workpiece is large, the electron beam 1 is susceptible to deflection caused by the spatial magnetic field within the distance, and the magnitude and direction of the magnetic field are changed by many external factors. In order to prevent the influence of the space magnetic field on the electron beam 1, a device for shielding the magnetic field, namely a magnetism isolating cylinder is required to be additionally arranged at the outlet of the electron beam 1, and the magnetism isolating cylinder is made of mu metal and can isolate the magnetic field to a certain extent.
Then, a set of two L-shaped test pieces 2 are taken firstly, and a welding parameter of the electron beam 1 is tested, wherein the welding parameter of the electron beam 1 requires that weld joints on the front side and the back side of the two L-shaped test pieces 2 are well formed. And replacing the second group of two L-shaped test pieces 2, and welding a first scribed line close to the edge on the first layer of test piece so as to prevent the welding deformation of the test piece from influencing the subsequent measurement and cause errors in the calculation result.
S4: as shown in fig. 8 to 10, since the distance between the two L-shaped test pieces 2 is large, in order to ensure that the two L-shaped test pieces 2 are welded through, the focusing must be performed by using down-focusing, and the use of down-focusing will result in a wide weld on the front surface of the second layer of L-shaped test piece 2, which may cover two adjacent scribed lines, thereby being inconvenient for measurement. Whether the welding seam deviates from the butt joint surface is judged most obviously from the reverse side of the welding seam, so that the measurement of the deviation value of the welding seam deviating from the butt joint surface is carried out on the reverse side of the welding seam on the second layer of test piece.
Firstly, the inclination direction of the electron beam 1 can be judged from the welding line on the back side of the L-shaped test piece 2 on the second layer, the moving axis of the welding line is an X axis during welding, and the positive direction of the deviation of the welding line to a Y axis can be seen. In general, the inclination angle of the electron beam 1 is relatively small, so the deviation distance shown on the L-shaped test piece 2 is also relatively small, so in order to reduce the measurement error during measurement, a magnifying lens is needed for assistance, and the measurement of the L-shaped test piece 2 is performed by using a magnifying lens with ten times of scales (the minimum scale is 0.01 mm); and during measurement, the adjacent scribed line on the left side of the welding seam is taken as a reference, and measurement is carried out along the transverse scribed line direction.
Center deviation value OY of weld 1 The calculation formula of (c) is:
W 1 : the left side of the welding line is away from the width of the adjacent scale mark 3;
W 2 : the right side of the welding seam is away from the width of the adjacent scale mark 3;
s: the distance between adjacent scale marks 3 on the L-shaped test piece 2;
obtaining the center deviation value OY of the welding seam according to a calculation formula 1 Is 1.157mmm, and then the offset OY of the first layer of the L-shaped test piece 2 is calculated according to the known data 2 ，OY 2 The calculation formula of (c) is:
OY 1 : a central deviation value of a welding seam;
D 1 : the distance between the electron beam 1 and the bottom surface of the first layer of L-shaped test piece 2;
D 2 : the distance between the center of the deflection yoke 5 and the exit of the electron beam 1;
D 3 : the distance between the bottom surface of the first layer of L-shaped test piece 2 and the bottom surface of the second layer of L-shaped test piece 2;
calculating the deviation OY of the L-shaped test piece 2 on the first layer 2 When the distance from the electron beam 1 to the bottom surface of the first L-shaped test piece 2, i.e. D, cannot be used directly 1 . Since the electron beam 1 is deflected when passing the deflection yoke 5, typically starting from the center of the deflection yoke 5, the distance from the center of the deflection yoke 5 to the exit of the electron beam 1 is measured to be 30mm, the value calculated by substituting (D) should be 1 +D 2 ) Namely 522+30=552, and OY is obtained according to the formula 2 Is 5.322mm.
S5: after the deflection coil 5 is electrified with direct current, a uniform magnetic field can be generated between the two poles, and when electron rays pass through the magnetic field, lorentz magnetic force can be generated, wherein the direction of the Lorentz magnetic force is vertical to the original movement direction of the electrons. This deflects the electron beam 1, and the direction and amount of deflection can be adjusted by changing the magnitude and direction of the current in the deflection coil 5. In general, two sets of coils in the deflection yoke 5 control the X and Y directions, respectively, and are aligned with the X and Y directions of the mechanical axis.
The deviation OY of the electron beam 1 in the positive direction of the Y-axis on the first layer of L-shaped test piece 2 is obtained 2 Then, correcting and verifying the corrected value on the first layer L-shaped test piece 2, and obtaining the positive bias OY of the electron beam 1 on the first layer test piece towards the Y-axis through the measurement and calculation 2 5.322mm, therefore, a correction was made on the first layer coupon:
s5-1: a spot is formed on the upper and lower small beam flows of the first layer of L-shaped test piece 2, and a reference cross line on the observation screen is adjusted to enable the cross point of the reference cross line to be positioned in the center of the spot;
s5-2: moving the mechanical axis Y and moving the deviation value OY in the negative direction of the Y axis 2 I.e., 5.322mm, and then the reference reticle intersection is adjusted back to the beam spot center;
s5-3: opening a deflection coil 5 and discharging small beam current, and enabling a beam spot to be superposed with a cross point of a reference cross line by adjusting Y-direction parameters of the deflection coil 5;
s5-4: obtaining a parameter of a deflection coil 5, welding the electron beam 1 centering the first layer L-shaped test piece 2 against the third scale mark 3 of the edge after setting the parameter, and measuring the centering effect of the two L-shaped test pieces 2 after the welding is finished.
S6: after the correction value is verified on the L-shaped test piece 2, lines are scribed at the positions 5mm away from the butt joint surface before the simulation piece is welded, and whether the welding line deviates from the butt joint surface is observed and measured by taking the scribed lines as reference after the welding is finished. The back welding seam of the second layer of the simulation piece is verified to be in the center of the two scribed lines, so that the expected effect is achieved.
Aiming at the beam perpendicularity control of the welding joint, the beam perpendicularity verification and alignment of the electron beam 1 welding beam are completed through five steps of determining a working distance, preparing an L-shaped test piece, welding the test piece, measuring a deviation value, calculating a correction value and verifying the correction value, so that the welding error of a first layer and a second layer in the welding process of the welding joint is solved, the welding deviation defect of a welding line of the second layer is avoided, and the welding efficiency of the electron beam 1 of the welding joint is greatly improved.
It should be noted that, in this document, the terms "comprises", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion, so that an article or apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrases "comprising 8230; \8230;" 8230; "does not exclude the presence of additional like elements in an article or device comprising the element.
The present invention is not limited to the above embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A perpendicularity verification and alignment method for an electron beam (1) welding beam is characterized by sequentially comprising the following steps of:
s1: determining the turnover angle of the part and the working distance of the electron beam (1) during welding according to the size and the structure of the part and the accessibility of the electron beam (1);
s2: preparing an L-shaped test piece (2), engraving scale marks (3) on the surface of the L-shaped test piece (2), and then clamping the two L-shaped test pieces (2) in a tool (4);
s3: firstly, two L-shaped test pieces (2) are taken for welding to obtain an electron beam (1) welding parameter, the electron beam (1) welding parameter requires that the weld joints on the front and back surfaces of the two L-shaped test pieces (2) are well formed, then two L-shaped test pieces (2) of a second group are replaced, and a first scale mark (3) close to the edge is welded on the first layer of L-shaped test pieces (2);
s4: the inclination direction of the electron beam (1) is judged from the welding line on the reverse side of the L-shaped test piece (2) of the second layer, then the measurement is carried out, the adjacent scale mark (3) on the left side of the welding line is taken as a reference during the measurement, the measurement is carried out along the direction of the transverse scale mark (3), and the width from the left side of the welding line to the adjacent scale mark (3) is W 1 The width of the right side of the welding line from the adjacent scale mark (3) is W 2 The distance between adjacent scale marks (3) is S; center deviation value OY of weld 1 The calculation formula of (2) is as follows:
W 1 : the left side of the welding line is far away from the width of the adjacent scale mark (3);
W 2 : the right side of the welding line is away from the width of the adjacent scale mark (3);
s: the distance between adjacent scale marks (3) on the L-shaped test piece (2);
then, the deviation OY of the first layer of L-shaped test piece (2) is calculated according to the known data 2 Said OY 2 The calculation formula of (2) is as follows:
OY 1 : a central deviation value of a welding seam;
D 1 : the distance between the electron beam (1) and the bottom surface of the first layer of L-shaped test piece (2);
D 2 : the distance between the center of the deflection coil (5) and the outlet of the electron beam (1);
D 3 : the distance between the bottom surface of the first layer of L-shaped test piece (2) and the bottom surface of the second layer of L-shaped test piece (2);
s5: the deviation OY of the electron beam (1) on the first layer L-shaped test piece (2) to the positive direction of the Y axis is known 2 And then, correcting and verifying a corrected value on the first layer of L-shaped test piece (2):
s5-1: a spot is formed on the upper and lower small beam flows of the first layer of L-shaped test piece (2), and a reference cross line on the observation screen is adjusted to enable the cross point of the reference cross line to be positioned in the center of the spot;
s5-2: moving the mechanical axis Y and moving the deviation value OY in the negative direction of the Y axis 2 Then adjusting the cross point of the reference cross line back to the center of the beam spot;
s5-3: opening a deflection coil (5), feeding a small beam, and enabling a beam spot to coincide with a cross point of a reference cross line by adjusting Y-direction parameters of the deflection coil (5);
s5-4: obtaining a parameter of a deflection coil (5), welding the electron beam (1) to a third scale mark (3) near the edge of the first layer L-shaped test piece (2) after the parameter is set, and measuring the centering effect of the two L-shaped test pieces (2) after the welding is finished;
s6: after the correction value is verified on the L-shaped test piece (2), verifying on a simulation piece simulating the outline of a real part, engraving scale marks (3) at two sides of the butt joint surface before the simulation piece is welded, and observing and measuring whether the welding seam deviates from the butt joint surface by taking the scale marks (3) as reference after the welding is completed.
2. The method for verifying and aligning the perpendicularity of the welding beam current of the electron beam (1) according to claim 1, wherein the graduation marks (3) in the step S2 comprise a plurality of sets of parallel graduations (31) which are arranged on the front and back sides of the L-shaped test piece (2) and are parallel to the movement track of the electron beam (1) and vertical graduations (32) which are arranged on the front and back sides of the L-shaped test piece (2) and are perpendicular to the movement track.
3. The method for verifying and aligning the perpendicularity of the welding beam current of the electron beam (1) according to claim 2, wherein in the step S2, the tool (4) is turned over when the L-shaped test piece (2) is clamped, then the frame-type level meter is used for measuring the clamping surface, the clamping surface is ensured to be parallel to the moving axis by adjusting the rotating shaft, the L-shaped test piece (2) is clamped after the adjustment is completed, and the projection overlapping of the two L-shaped test pieces (2) in the direction vertical to the welding surface is ensured.
4. The method for verifying and aligning the perpendicularity of the welding beam current of the electron beam (1) according to claim 1, wherein a magnetism isolating cylinder made of mu metal is additionally arranged at the outlet of the electron beam (1) before the L-shaped test piece (2) is welded in the step S3.
5. The method for verifying and aligning the perpendicularity of the welding beam current of the electron beam (1) according to claim 1, wherein the measurement in the step S4 is assisted by a magnifying glass, and the measurement of the L-shaped test piece (2) is performed by a magnifying glass with ten times of scales.
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